Derivative Instruments (Balance Sheet Disclosures) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Interest Rate Cash Flow Hedges
Interest rate contract losses expected to be reclassified to statements of operation in the next twelve months	$ 300,000
Interest Rate Contract [Member] \| Designated as Hedging Instrument
Derivatives, Fair Value
Derivative, Fair Value, Net	(254,000)	(348,000)
Interest Rate Contract [Member] \| Designated as Hedging Instrument \| Other Assets [Member]
Derivatives, Fair Value
Derivative Assets, Noncurrent	73,000	69,000
Interest Rate Contract [Member] \| Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value
Derivative liabilities	327,000	362,000
Interest Rate Contract [Member] \| Designated as Hedging Instrument \| Other Long-term Liabilities
Derivatives, Fair Value
Derivative liabilities	$ 0	$ 55,000

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section A

-Paragraph 4

-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 815

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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

+ Details

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details